Parametric metasurfaces for electromagnetic wave amplification

TL;DR

This paper demonstrates a metasurface-based parametric amplifier capable of achieving over 10 dB gain for electromagnetic waves, with controllable amplification through parametric modulation, supported by theoretical and numerical analysis.

Contribution

It introduces a variable capacitor-loaded metasurface design for electromagnetic wave amplification and analyzes its operational regimes and stability thresholds.

Findings

Achieves over 10 dB gain with a single-layer metasurface.

Gain is controllable via parametric modulation.

Theoretical model aligns well with numerical simulations.

Abstract

We study parametric amplification of electromagnetic waves using metasurfaces. We design a variable capacitor-loaded metasurface that can amplify incident electromagnetic waves. We analyze various regimes of operation of the system and find that we can achieve a significant gain (over 10 dB) in just one layer of such a structure, and this gain can be controlled by parametric modulation. We study the instability threshold for this system and show that a simple theoretical model agrees well with the results of full numerical simulations.